Answer: (2) 42 yearsExplanation:-
The total age of nine friends = 333 years
The total age of nine friends after 5 years = 333 + 9 x 5
= 333 + 45
= 378 years
Then, the average of nine friends = 378/9
= 42 years
Hence, the average age of nine friends after 5 years is 42 years.